Summary In-Depth Guide to Machine Learning: Key Concepts, Methods, and Applications
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Course
CS7052
Institution
London Metropolitan University (LMU)
This guide provides a detailed look into machine learning, covering fundamental concepts, types of learning, and important algorithms. It explores key components such as data, features, and models, and discusses various applications across different fields. The guide also addresses challenges and f...
Machine Learning (ML) Overview
Machine Learning (ML) is a branch of artificial intelligence (AI) that
focuses on creating systems that can learn from data, adapt, and
make decisions without being explicitly programmed for each
specific task. Instead of using static algorithms, ML systems learn
and improve their performance through experience.
1. Types of Machine Learning
1.1 Supervised Learning
In supervised learning, models are trained on a labeled dataset,
where each training example is paired with an output label. The
system learns to map inputs to outputs based on this data.
Regression: This technique is used to predict continuous
numerical values. For example, predicting the price of a house
based on its features (like size, number of rooms, location). The
goal is to find a function that best fits the relationship between
input features and the target value.
Classification: This involves predicting discrete labels or
categories. For instance, classifying emails as spam or not spam.
The model is trained to recognize patterns that differentiate
between classes.
, 1.2 Unsupervised Learning
Unsupervised learning works with unlabeled data. The system tries
to uncover hidden patterns or structures within the data without
prior knowledge of the outcomes.
Clustering: This method groups similar data points together. For
instance, clustering customer data to identify different segments
within a market based on purchasing behavior. Common
algorithms include k-means clustering, which partitions data into k
distinct clusters.
Dimensionality Reduction: This technique reduces the number of
features or variables in the data while preserving as much
information as possible. Principal Component Analysis (PCA) is a
popular method used to reduce the number of features while
maintaining the variability of the data.
1.3 Semi-Supervised Learning
Semi-supervised learning is a hybrid approach that uses a small
amount of labeled data and a large amount of unlabeled data.
This method is useful when labeling data is expensive or time-
consuming. It leverages the structure in the unlabeled data to
improve learning accuracy.
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